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        <p>平常写一些简单验证程序时，需要频繁输出日志信息便于调试。为了后续验证程序中输出日志信息方便，将平时使用的日志信息抽象成了INFO和FUNC。</p>
<ul>
<li>INFO输出单行日志信息，可以输出当前的时间（格式：%Y-%m-%d %H:%M:%S）、进程号和线程号。</li>
<li>FUNC利用RAII可以在生命周期（比如函数）的开始和结束分别打印日志信息，并统计执行耗时（单位微妙）<a id="more"></a>

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<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;iostream&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;unistd.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;chrono&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;iomanip&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;ctime&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;sstream&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;string&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> INFO(msg) \</span></span><br><span class="line"><span class="keyword">do</span> &#123; \</span><br><span class="line">    <span class="keyword">auto</span> now = <span class="built_in">std</span>::chrono::system_clock::now(); \</span><br><span class="line">    <span class="keyword">auto</span> t = <span class="built_in">std</span>::chrono::system_clock::<span class="keyword">to_time_t</span>(now); \</span><br><span class="line">    <span class="keyword">auto</span> <span class="keyword">fmt_t</span> = <span class="built_in">std</span>::put_time(<span class="built_in">std</span>::localtime(&amp;t), <span class="string">"%Y-%m-%d %H:%M:%S"</span>); \</span><br><span class="line">    <span class="built_in">std</span>::<span class="built_in">ostringstream</span> oss; \</span><br><span class="line">    oss &lt;&lt; <span class="keyword">fmt_t</span> &lt;&lt; <span class="string">" ["</span> &lt;&lt; getpid() &lt;&lt; <span class="string">"|"</span> &lt;&lt; gettid() &lt;&lt; <span class="string">"] "</span> &lt;&lt; msg &lt;&lt; <span class="string">"\n"</span>; \</span><br><span class="line">    <span class="built_in">std</span>::<span class="built_in">cout</span> &lt;&lt; oss.str(); \</span><br><span class="line">&#125; <span class="keyword">while</span> (<span class="number">0</span>)</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> _<span class="title">UniInfo</span> &#123;</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    _UniInfo(<span class="keyword">const</span> <span class="built_in">std</span>::<span class="built_in">string</span>&amp; msg) : msg_(msg) &#123;</span><br><span class="line">        start_ = <span class="built_in">std</span>::chrono::system_clock::now();</span><br><span class="line">        INFO(msg_ &lt;&lt; <span class="string">" Enter"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    ~_UniInfo() &#123;</span><br><span class="line">        INFO(msg_ &lt;&lt; <span class="string">" Exit"</span>);</span><br><span class="line">        <span class="keyword">auto</span> end = <span class="built_in">std</span>::chrono::system_clock::now();</span><br><span class="line">        <span class="keyword">auto</span> elapsed = <span class="built_in">std</span>::chrono::duration_cast&lt;<span class="built_in">std</span>::chrono::microseconds&gt;(end - start_).count();</span><br><span class="line">        INFO(msg_ &lt;&lt; <span class="string">" elapsed time: "</span> &lt;&lt; elapsed &lt;&lt; <span class="string">" microseconds"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"><span class="keyword">private</span>:</span><br><span class="line">    <span class="built_in">std</span>::<span class="built_in">string</span> msg_;</span><br><span class="line">    <span class="built_in">std</span>::chrono::system_clock::time_point start_;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> FUNC(msg) \</span></span><br><span class="line">    <span class="built_in">std</span>::<span class="built_in">ostringstream</span> _oss; \</span><br><span class="line">    _oss &lt;&lt; msg; \</span><br><span class="line">    _UniInfo _uniInfo(_oss.str());</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> FUNCTION() FUNC(__func__)</span></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">(<span class="keyword">int</span> argc, <span class="keyword">char</span>* argv[])</span> </span>&#123;</span><br><span class="line">    FUNCTION();</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<blockquote>
<p>INFO中之所以先ostringstream再cout，是由于msg中有可能会存在函数调用，是函数调用先执行后再cout。</p>
</blockquote>

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